Clarence l



(No Model.)

' .0. L- HEALY.

PRINTING TELEGRAPH. No. 341,656. Patented May 11, 1886.

UNITED STATES PATENT OFFICE.

CLARENCE L. HEALY, OF BROOKLYN, ASSIGNOR TO THE COMMERCIAL TELEGRAM COMPANY, OF NEW YORK, N. Y.

PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No 341,656, dated May 11, 1886.

Application filed February 9, 1886. Serial No. 191,280. (X0 model.)

To aZZ whom it may concern.-

Be it known that I, CLARENCE L. HEALY, of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Printing-Telegraphs, of which the following is a specification.

Heretofore in printing-telegraphs wherein the receivers or printers are provided in the circuit of the type-wheel escapement-magnets with a neutral magnet caused by variations in the strength of current in such circuit to attract its armature or permit it to fall away, and thus effect the shifting of the movement from one type-wheel to the other, it has been usual to produce this variation in the current by throwing resistance into the circuit after the type-wheel is positioned, but before the printing-magnet acts. By my present invention I accomplish the same end in a simpler, and, under some circumstances, more desirable way, by shunting 0r grounding the line.

The invention is illustrated in the accompanying drawing, which is a view principally in diagram of the apparatus.

A is the transmitter key-board, having letter and figure keys at and unison-keys b 0. These keys 6 I) act upon a switch-lever, c, pivoted between them, and shifted one way or the other by the depression of such keys. At its outer end switch-lever 0 plays over two blocks, d d, resting on one or the other, according to whether key 5 orb were last depressed. Wires 1 2 run to blocks (Z d, and through lever 0 form the base-connection of key-board A.

13 is the sunflower of transmitter, .O the current'reversing drum, and D the stoppingmagnet. The'blocks of sun flower are connected by wires 3 to contactsprings c beneath the keys of transmitter, while the arm f, traveling over sunflower, is connected by wire 4 to.

stopping-magnet D, and from thence to one pole of a battery, E, dynamo-electric machine, or other source of electrical energy. ire 1 runs to one side of a relay magnet, F, to the other side of which is a connection, 5, from battery E. Magnet F controls, directly or indirectly, the local circuit including the printing-circuit relays, as will be well understood. XVire 2 runs to another magnet, G, and from thence to wire 1. Magnet G is the shiftingmagnet for varying the current in the typewheel circuits at the printers.

It will be seen that the operating-circuit of transmitter includes wire 1 or wire 2, accord ing to position of switch-lever c. When lever c is on block d, wire 1 is in circuit, and so is magnet F, magnet G being out of circuit. \Vhen lever. 0 is on block (2, wire 2 is in circuit, and so are both magnets F and G.

L is one of the type-wheel line-wires, including at each printer on the line the type-wheel escapement-magnet-s H andthe neutral magnet I. This line runs to a central brush, g, on transmitter-cylinder B, and is connected by plates on cylinder alternately with two other brushes, h it, connected by wires 6 7, through oppositelyarranged batteries K K, to earth.

As so far described in connection with the drawing, the apparatus is that well understood and at present in use.

Heretofore magnet G has been employed to throw resistance into line L, causing neutral magnet I to release its armature. By this invention an earth-connection, 8, is made from line L at a point between transmitter-cylinder B and the first printer onthe line, which earthconnection is controlled, directly or indirectly, by magnet G. As shown, the earth-connection 8 runs to armaturelever of magnet G, and to the front point thereof. A resistance, R, is preferably included in this ground-connection, and this resistance is preferably adjustable, as shown, so as to permit of an adjustment of the ground'connection to the conditions of the line, and to compensate for any change that may be made in the number of printers on the line, although the connection 8 may run directly-t0 earth. \Vith switch'lever c on block d, as shown, when the transmitter is stopped the full current will remain on line L, magnet G not being energized, and neutral magnets I of printers will attract their armatures, and the printingwill be effected (through circuits controlled by magnet F) with full current on type-wheel lines and armatures of magnets I drawn forward. \Vith switcl1-lever c on block (1, bringing magnet G into operating-circuit, when transmitter is stopped magnet G will close ground-connection 8, and the current from line L will be shunted from the printers to earth. The neutral magnets I of printers will thus be weakened or demagnetized, and will permit their armatures to fall back, and the printing will be effected with arniatures of I in this retracted position;

What I claim is- 1. In printing-telegraphs, the combination, with a transmitter and printers operated therefrom, of the type-wheel line including the escapement-magnets and neutral shiftingmagnets and a groundeonnection from typewheel line between transmitter and printers, said ground-connection being controlled by the transmitter for shunting current from the type-wheel line when the transmitter is stopped, substantially as and for the purpose set forth.

2. In printing-telegraphs, the combination, with atransmitter and printers operated therefrom, of the type-wheel line including the escapement-magnets and neutral shifting-magnets, a ground-connection from type-wheel line between transmitter and printers, a magy net controlling said ground-connection, and means at the transmitter for controlling this magnet, substantially as and for the purpose set forth.

3. In printing-teegraphs, the combination,

[with a transmitter and printers operated therefrom, of the type-wheel line including l the escapement-magnets and neutral shiftingmagnets, a ground-connection from type-wheel line between transmitter and printers, a magnet controlling said ground-connection, and a switch at the transmitter key-board for including this magnet in the transmitter-operating circuit, substantially as and for the purpose set forth.

4. In printing-telegraphs, the combination, with a transmitter and printers operated the escapement-magnets and neutral shiftingmagnets, a ground-connection from type-wheel line between transmitter and printers, said ground-ccnnection being controlled by the transmitter for shunting current from the typewheel line when the transmitter is stopped, and an adjustable'resistanee in said groundpose set forth.

This specification signed and witnessed this 23d day of January, 1886.

\Vitnesses:

WV. 13. HERBERT, O. BLAUYELT.

connection, substantially as and for the pur p therefrom, of the type-wheel line including I 

